However, encrypted PDFs cannot be edited further, so the original author should always keep an unencrypted version. Preview can encrypt PDF documents, and restrict their use for example, it is possible to save an encrypted PDF so that a password is required to copy data from the document, or to print it. As of OS X 10.4 ( Tiger), Preview lost playback functionality and animated GIF files are displayed as individual frames in a numbered sequence. The version of Preview included with OS X 10.3 ( Panther) could play animated GIF images, for which an optional button could be added to the toolbar.
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