[pdftex] xpdf (was: [Gs-devel] Re: [firstname.lastname@example.org: Re: EFF
placeholder page for when we have PDF rather than HTML])
ray at artifex.com
Sun Feb 10 23:13:22 PST 2002
"L. Peter Deutsch" wrote:
> > Looking at the work required at the technical level, you're right. But I
> > had a feeling that there were patents in PDF 1.4 that might stop a
> > competing implementation dead. :-(
> I hope Raph Levien, who has studied the PDF 1.4 transparency specification
> very carefully and has some opinions on the patent situation with respect to
> it, will reply on this issue.
> > Someone should look into the patent situation. Ah, actually, I think I'm
> > remembering patents on parts of PostScript level 3, that prevent a PS
> > level 3 clone. I don't know if they would include PDF 1.4.
> I know of no such patents.
Actually, there are a couple of problematic areas. Since both Level 2
PS and PDF support TrueType fonts (Type 42 in the case of PS), the
TT hinting patents impede full implementation of a TrueType Font renderer.
Also the patents in the trapping area (so far) seem to impede most
implementations of in-RIP trapping of LL3.
Note that these aren't Adobe patents, but get in the way none the less.
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