10. The one or more non-transitory computer-readable media of claim 8 , wherein determining whether the request is valid includes evaluating a security token.
10. The one or more non-transitory computer-readable media of claim 8 , wherein determining whether the request is valid includes evaluating a security token. 11. The one or more non-transitory computer-readable media of claim 10 , wherein inserting the one or more zero-length vectors includes inserting the one or more zero-length vectors at the one or more locations in the font file according to a pattern based on the security token.