anti-cracking library 1.0
Breakpoint - a place, where debugger stops program execution. Breakpoints are set by debugger.
Opcode - binary representation of Assembler instruction. For example, Int 3 has opcode $CC, NOP has opcode $90,...
PE header (Portable Executable header) - every Windows exe consist of DOS MZ header (used if program is run under DOS) and a new PE header. PE header contains information for Windows EXE loader like Image Base (prefered memory location), Code size (size of executable code), Import table (table used for importing functions from DLLs) and many other things.