before explaining the disclosed embodiments of the present invention in detail it is to be understood that the invention is not limited in its applications to the details of the particular arrangements shown since the invention is capable of other embodiments . also , the terminology used herein is for the purpose of description and not of limitation . a list of the components used with the invention will now be described . 1 . barrier system 10 . flexible plastic film barrier panel . can be transparent or colored opaque . 20 . 2 ″ snap on rail clip . 30 . 8 ″ snap on rail clip . 40 . existing banister with post supported ends . 45 . railing 50 . 2 ″ banister post . 60 . 8 ″ banister post . 70 . side wall . 80 . deck . 90 . logo , trademark , or other advertising printed onto film barrier . 100 . seam between film barrier panels . 110 . 8 ″ clamping finger . 120 . 2 ″ clamping finger . 130 . 2 ″ clamp retaining snap . 140 . 8 ″ clamp retaining snap . 150 . 1 ″ wide self - adhesive magnet strip adhered to 2 ″ rail post . 160 . ½ ″ wide self - adhesive magnet strip adhered to 0 . 8 ″ rail post . 170 . 1 ″ wide self - adhesive magnet strip adhered to plastic film barrier panel . 180 . ½ ″ wide self - adhesive magnet strip adhered to plastic film barrier panel . 190 . hook and loop , double sided tape , or zip - tie ( vdz ) mounted rail clip . 200 . hook and loop or double sided tape . 210 . vdz clamping finger 220 . vdz mounting surface for double sided tape or self - adhesive velcro . 230 . pass - through hole for zip ties or hook and loop strap . 240 . zip tie . 250 . existing banister with wall supported ends . 260 . 1 ″ wide self - adhesive magnet strip adhered to side wall . 270 . 1 ″ wide self - adhesive magnet strip adhered to folded panel flange . 280 . flange folded on end of flexible plastic film to interface to side wall . 290 . hook and loop strap . 300 . 2 ″ strap rail clip . 310 . strap clip retaining snap . 320 . strap clip hinged strap bar . 330 . strap clip snap cutout . 340 . plastic live hinge . 350 . full length clamp with strap rail clips incorporated into each end . 360 . full length clamping bar clamps the full length of the seam between film barriers . 370 . buckle strap . 380 . buckle . 390 . alternate snap on rail clip . 392 . front flat face of finger 394 . inner convex face of finger 396 . side leg with snap end ( hook end ) 398 . side leg with snap end ( hook end ) 400 . alternate hook and mount clip . 402 . head end 403 . side slot for strap 404 . front flat face of finger 406 . inner convex face of finger fig1 is a front view of an existing banister 40 with posts 50 / 60 that support railing 45 on a deck 80 with side walls 70 . fig2 is a front view of the banister 40 of fig1 with the novel barrier system 1 installed . fig3 is an enlarged perspective partial view of the installed barrier system 1 of fig2 . fig4 is an enlarged perspective view of an 0 . 8 ″ rail clip 30 for the installed barrier system 1 of fig2 . fig5 is an enlarged perspective view of a 2 ″ rail clip 20 for the installed barrier of fig2 . fig6 is a rear perspective view of the installed barrier system 1 of fig3 . fig7 is a rear perspective view of the 0 . 8 ″ rail clip 30 of fig4 . fig8 is a rear perspective view of the installed 2 ″ rail clip 20 of fig5 . fig9 is an exploded front perspective view of barrier system 1 ready to be installed . fig1 shows a partially rolled flexible plastic film barrier 10 with magnet strips 170 , 180 that can be adhered to the plastic barrier panel 10 . fig1 shows the plastic film barrier 10 of fig1 unrolled and ready to be installed . fig1 is a top view of the 2 ″ snap on rail clip of fig5 and 8 . fig1 is a perspective view of the 2 ″ snap on rail clip 20 of fig5 , 8 and 12 . fig1 is a front view of the 2 ″ snap on rail clip 20 of fig5 , 8 , 12 and 13 . fig1 is a side view of the 2 ″ snap on rail clip 20 of fig5 , 8 , and 12 - 14 . fig1 a top view of the 0 . 8 ″ snap on rail clip 30 of fig4 , and 7 . fig1 is a perspective view of the 0 . 8 ″ snap on rail clip 30 of fig4 , 7 and 16 . fig1 is a front view of the 0 . 8 ″ snap on rail clip 30 of fig4 , 7 , 16 and 17 . fig1 is a side view of the 0 . 8 ″ snap on rail clip 30 of fig4 , 7 , and 16 - 18 . referring to fig1 - 10 , the novel barrier system 1 can be installed to cover the inner sides of posts 50 of an existing banister 40 . a flexible semi - rigid plastic film barrier panel 10 can be transparent and / or colored opaque . additionally , the panel 10 can have indicia thereon , such as but not limited to business signage , messages , and the like . the panel can have various thicknesses , such as but not limited to being several mils thick to being approximately 14 to approximately 16 mils thick . the panels can be treated for uv ( ultra violet rays ) exposure . the invention can use double sided magnetic tape , such as the double side magnetic tape described in u . s . patent application publication 2001 / 0055666 to lee et al ., which is incorporated by reference . the invention can use either or both 1 ″ wide double sided self - adhesive magnetic strips 170 , and / or ½ ″ wide double sided self - adhesive magnetic strips 180 . before installation , the installer can cut desired sections of the flexible plastic film barrier panel 10 from a roll . the 1 ″ wide self - adhesive magnetic strips 170 can be adhered to one side of the flexible plastic film barrier in parallel arrangements with one another , which can be spaced apart to overlay the inner surfaces of the 2 ″ banister posts 50 . additionally , the ½ ″ wide self - adhesive magnetic strips 180 can be adhered to one side of the flexible plastic film barrier in parallel arrangements with one another , which can be spaced apart to overlay the inner surfaces of the 0 . 8 ″ banister posts 60 . the 1 ″ wide self - adhesive magnetic strips 150 can be adhered to the inner surfaces of the 2 ″ banister posts 50 . additionally , the ½ ″ wide self - adhesive magnetic strips 160 can be adhered to the inner surfaces of the 0 . 8 ″ banister posts 60 . the installer can position to orient the selected sheet of panel 10 so that the exposed magnetic surfaces of strips 170 on panel 10 attach to the exposed magnetic surfaces of strips 150 on posts 50 . similarly , the exposed magnetic surfaces of strips 180 on panel 10 attach to the exposed magnetic surfaces of the strips 160 on posts 60 . referring to fig1 - 19 , the mounted sheet panels 10 can be oriented end to end with one another on the posts 50 , 60 of the banister 40 so that any vertical seams 100 overlay a mid portion of the larger 2 ″ banister posts 50 . referring to fig5 , 6 , 8 , 9 , 12 - 15 , the 2 ″ snap on rail clips 20 can have side legs each with hooked ends 130 which allow the clips 20 to snap about the posts 50 . the installer can orient the clips 20 so that the s shaped 2 ″ clamping fingers 120 on upper and lower placed clips 20 overlays against upper and lower seam edges 100 of the side by side panels 10 . referring to fig4 , 6 , 7 , 9 , and 16 - 19 , the 0 . 8 ″ clips 30 can have side legs each with hooked ends 140 which allow the clips 30 to snap about the posts 60 . the installer can orient the clips 30 so that the s shaped 0 . 8 ″ clamping fingers 110 on upper and lower placed clips 30 can hold top and bottom edges of the panel 10 against the posts 60 . fig2 is an exploded view of another type of rail clip 190 having a generally upside down j shape with the leg portion also having a generally s shape . the hook portion of the j can be attached to a post 50 / 60 by one or two zip ties 240 that each can be inserted between the hook and s shape portions of the clip and adjustably tightened about the posts 50 / 60 . fig2 shows the installed rail clip 190 mounted to the post 50 / 60 of the banister 40 of fig2 . fig2 is an exploded view of a rail clip 190 being installed with interlocking hook / loop fasteners 200 and / or double sided tape 200 to a post 50 / 60 of a banister 40 . the installer can attach one side of the hook and loop fastener or double sided tape to the post 50 / 60 , and the mating side of the hook and loop fastener or double sided tape to the outer surface of the hook portion of the clip 190 . fig2 shows the installed rail clip 190 mounted to the post 50 / 60 of the banister 40 of fig2 . fig2 is an exploded view of a rail clip 190 being installed with strap fasteners 290 that each can be inserted between the hook and s shape portions of the clip 190 and adjustably tightened about the posts 50 / 60 . the strap fasteners 290 can be strips with hook and loop fasteners along the surfaces . fig2 shows the installed rail clip 190 mounted to the post of the banister 40 of fig2 . fig2 is a top view of the rail clip 190 used in fig2 - 25 . fig2 is a perspective view of the rail clip 190 of fig2 - 26 . fig2 is a front view of the rail clip 190 of fig2 - 27 . fig2 is a side view of the rail clip 190 of fig2 - 28 . referring to fig2 - 29 , the rail clip 190 can include a s shaped clamping finger 210 with an upper end attached to a hook edge 220 having an exterior mounting surfaces for mounting the double sided tape and / or double sided hook and loop fasteners thereon . the hook edge 220 can also have a pass - through 230 for allowing the zip tie ( s ) 240 to pass therethrough . fig3 is a front perspective view of another installed strap rail clip 300 . fig3 is a rear perspective view of rail clip 300 of fig3 with strap bar 320 attached to hinge 40 in an unfastened position . fig3 is a rear perspective view of the rail clip 300 of fig3 - 31 with strap bar 320 fastened . fig3 is a top perspective view of rail clip 300 of fig3 - 32 with strap rail clip 300 fastened about a post 50 / 60 . fig3 is a top perspective view of the rail clip 300 of fig3 - 33 with strap rail clip bar 320 unfastened . fig3 is a rear perspective view of the rail clip 300 of fig3 - 34 with strap rail clip bar 320 fastened . fig3 is a rear perspective view of the rail clip 300 of fig3 - 35 with strap rail clip bar 320 unfastened . referring to fig3 - 36 , clip 300 can have a front side with an s shaped clamping finger 120 with rear sides having a strap clip hinged strap bar 320 with an outer end that can bend about the rear of a post 50 / 60 , with a strap clip snap cutout 330 thereon . opposite strap portion of clip 300 can have an end with a snap clip retaining snap 310 that can snapably attach into the snap cutout 330 locking the clip 300 to the post 50 / 60 . fig3 is a front perspective exploded view of a barrier system 1 being installed with full length post clamp 350 . fig3 is an enlarged view of a top of a full length post clamp 350 ready for installation . fig3 is a front perspective view of the barrier system 1 of fig3 installed on a banister 40 . fig4 is an enlarged view of a top of the installed full length post clamp 350 installed on a post 50 / 60 . fig4 is a rear perspective view of full length post clamp 350 with open clips . fig4 is a rear perspective view of the full length clamp 350 of fig4 with clips closed . fig4 is a front perspective view of the full length clamp 350 of fig4 with clips closed . referring to fig3 - 43 , the full length clamp 350 can have a full length clamping bar portion 360 with snap clip retaining snap 310 , strap clip hinged strap bar 320 , strap clip snap cutout 330 and hinge 340 , which function and install as previously described about the posts 50 both above and below the panel 10 . the elongated bar portion 360 can also be attached to post 50 using any of the previously described clips . the elongated bar portion 360 allows for the seams 100 between the panels to be more completely covered and protected from peeling off . fig4 is a perspective view of the barrier system 1 of the preceding figures installed on an existing banister 250 whose railings are attached directly to a wall . fig4 is an exploded view of the end of the barrier 10 with magnetic strip 260 thereon . the outer side edge 280 of the panel 10 can be folded to form a flange in order to interface with a fall surface . a 1 ″ wide self - adhesive magnetic strip can be adhered to an outer surface of the flange 280 . another 1 ″ wide self - adhesive magnetic strip 260 can be adhered to the side wall , so that both magnetic strips 260 , 270 attach to one another . fig4 is an exploded perspective view of a clip 190 previously described with a belt buckle strap 370 , 380 ready to be used to install a barrier 10 to a post 50 of a banister 40 . fig4 is a perspective view of the buckle strap clip 370 , 380 of fig4 installed to a post 50 of banister 40 . the buckle portion 380 allows for the clip 190 to be adjustably tightened about the post 50 / 60 . fig4 is a top view of another snap on rail clip 390 having a finger portion 392 , 394 with a generally flat exterior face 392 and a convex protruding inner face 394 . fig4 is a front view of the clip 390 of fig4 . fig5 is a side view of the clip 390 of fig4 . fig5 is a perspective view of the clip 390 of fig4 . this rail clip 390 can be an alternate snap on rail clip to the rail clip shown and described in relation to fig1 - 19 . the snap on rail clip 390 can include a front flat face of finger 392 , and an inner convex face of finger 394 with raised portion that presses against an upper or lower edge portion of the installed panel 10 or against a seam 100 in the installed panel ( s ) 10 . clip 390 can function similarly to the clips 20 , 30 by having both a first side leg with snap end ( hook end ) 396 , and a second side leg with snap end ( hook end ) 398 , wherein the legs snap about sides of posts 50 , 60 shown in the previous figures . fig5 is a top view of another strap rail clip 400 . fig5 is a front view of the clip 400 of fig5 . fig5 is a side view of the clip 400 of fig5 . fig5 is a perspective view of the clip 400 of fig5 . fig5 is a perspective view of the clip 400 of fig5 with a hook and loop strap 290 installed . this alternate clip 400 includes a head end 402 with side slot 403 that allows for a strap 290 , such as a hook and loop fastener strap to be inserted therethrough . clip 400 includes a finger portion with a front flat face 404 and an inner facing edge convex curved edge 406 that can press against an exterior portion of a panel 10 or a seam 100 between panel ( s ) 10 . the clip 400 attached to posts 40 / 60 similar to the clip 190 shown and described in reference to fig2 - 29 . the clips can be made from plastic , metal , combinations thereof , and the like . although dimensions for the post clips and tape strips are referenced above , the invention clip sizes and tape strips can vary depending upon the different diameter posts . although the double sided tape described above , uses magnets , the invention include double sided tape without magnets . additionally , the double sided tape can include hook and loop fasteners , such as mushroom headed fasteners . while the invention is described as a barrier for protecting pets and children , the barrier invention can be used for storm protection to prevent air , rain , snow , and the like , from passing through the openings between posts underneath railings . the novel barrier can be easily disassembled and put away when not being used . the invention can be installed by professionals , consumers , and / or be packaged in kit forms with the components in a package . while the invention is described for use with balconies , banisters and stair railings having posts , the invention can be used to cover openings between vertical posts in other applications , such as but not limited to cribs , bassinets , and the like . still furthermore , the protective barrier invention can be used to cover other openings , such as but not limited to doorways , windows , entrances to stairs , and any other type of opening . while the invention has been described , disclosed , illustrated and shown in various terms of certain embodiments or modifications which it has presumed in practice , the scope of the invention is not intended to be , nor should it be deemed to be , limited thereby and such other modifications or embodiments as may be suggested by the teachings herein are particularly reserved especially as they fall within the breadth and scope of the claims here appended .