some questions about license

[whatsup]

hey, i have a freeware closed soucre program i wrote.
the program uses some third party open soucre libs and components

what i do, is compile these open source libs to a lib file

to make the complete binary, the linker
link these compiled libs with my source all together

for example, i created from zlib soucre code
a file called zlib.a
and the linker links this file with my code.

my questions are:
1. do i have to open my source,
 or just the library source ?
2. i know there are different between gpl and lgpl
  i would like to know the answer in both cases.
3. if instead of a lib file, i create a dll,
 is there a different ?
4. can i use these libs in an open source form ?
  and provide their source, but not mine ?
  i mean instead of precompile these libs,
  each time i compile my source
  the compiler will also compile these libs directly from their
  source

thanks in advanced.

[BigChimp]

Please read this thread:
http://forum.lazarus.freepascal.org/index.php/topic,13401
... a lot of what you are asking has been discussed already.

[whatsup]

thank you this was helpfull
i also read the wiki
and i got it
the LGPL is what i need.
there are also some libs (like zlib,lzma)
that have no restrictions.

in my source i used one GPLv2 license (lzo compression library)
and now i deleted it.

i also have sources with no copyright at all,
which people wrote for examples.
so i suppose they are the same kind as zlib.

thank you very much.

[BigChimp]

Sounds good!