Creating a Loader to modify a DLL file

i see... but this dosen't explain "how to do it" as i see he meanded how to implement a process patch as it's done for normal exe files... you know loader,most of them in most cases, bypass crc checks when patching in mem. i have never see a loader for a packed .dll .. but i know if the exe loads(loadlibraryexa or loadlibrarya ?) a dll in start up maybe some code could be injected in the exe to patch the dll after been loaded.. this is an idea . i'm really interested for this topic since i got a case which the exe calls aprotected .dll .. and the dll controls evertyhing (OEP,Trial.......) the exe do an integrity check for the dll .. i wonder how could be patched and if it's possible to do someking of loader/injected code for a protected/packed .dll

Regards