Securing bespoke fonts in UIWebVIew

Within my application, I am utilizing a UIWebView to display HTML content. This content is retrieved from a server and then saved in the iPad's local file system to support offline access. The HTML content includes specialized fonts declared with @font-face in its CSS stylesheet:

@font-face {font-family: 'CustomFont'; src: url(Custom-Font.otf);}

In order for this functionality to function properly, the font file with a .otf extension must also be downloaded and stored within the iPad's file system.

An issue arises when considering the accessibility of the font file on the iPad's file system, which can pose legal concerns as many font providers restrict unauthorized distribution of their fonts (which may occur using this method).

My inquiry pertains to whether there exists a means by which I can encrypt these fonts within the file system and decrypt them as needed during the loading process within the UIWebView?

cssiosencryptionuiwebviewfont-face

Answer №1

For detailed information on securing data with on-disk encryption, check out the "iOS App Programming Guide" at this link.

In iOS 4 and newer versions, apps can utilize data protection to enhance the security of their on-disk data. This feature leverages the built-in encryption hardware found in certain devices (like the iPhone 3GS and iPhone 4) to store files in an encrypted form on the disk. When the user's device is locked, even the app that created these protected files cannot access them. To access a protected file, the user must unlock the device by entering the correct passcode at least once.

I haven't personally verified this, but I believe it's safe to assume that encrypted files would not be accessible using iExplorer.

Answer №2

After thorough research, I stumbled upon an effective solution: Check out the insightful guide by Robin Summerhill where he explains how to safeguard resources in your iOS App using Apple's CommonCrypto API and Custom URL protocols. This method allows you to encrypt all embedded resources, including fonts, ensuring enhanced security for your application.

Answer №3

Using fonts in your application without a proper license from the provider is a violation of copyright laws, even if you encrypt the files.

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