sorry, I was wrong, after some research, I found this:
http://www.unisys.com/unisys/lzw/default.asp In all cases, a written license agreement or statement signed by an authorized Unisys representative is required from Unisys for all use, sale or distribution of any software (including so-called "freeware") and/or hardware providing LZW conversion capability (for example, downloaded software used for creating/displaying GIF images). In certain cases, no license fees may be required, but this needs to be evidenced by a written agreement or written statement signed by an authorized Unisys representative.
http://www.unisys.com/unisys/lzw/default.asp In all cases, a written license agreement or statement signed by an authorized Unisys representative is required from Unisys for all use, sale or distribution of any software (including so-called "freeware") and/or hardware providing LZW conversion capability (for example, downloaded software used for creating/displaying GIF images). In certain cases, no license fees may be required, but this needs to be evidenced by a written agreement or written statement signed by an authorized Unisys representative.
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Compuserve proprietary image format, which they let people use freely.
Unisys owns the patent on the LZW compression technique used in the GIF
format. Compuserve now has to pay Unisys royalties for it's use along
with everyone else who uses LZW.
还有能不能让其公司授权于我?
程序本身上没有什么难度
不过那个unisys不会授权给
小公司,更不要说是个人
国外好象转换GIF格式的软件很多,难道他们都得到UNISYS的授权吗??
http://www.w3.org/Graphics/PNG/
http://www.libpng.org/pub/png/
应该有API提供的。