Okay, I need to create a Wikipedia-style document about SHA-256 under the categories of Technology > Software > License. Let me start by understanding what SHA-256 is. It's a cryptographic hash function, right? So first, I should explain what it is and its purpose.

The user wants an outline with sections like Introduction, then detailed sections with H2 and H3 headings. I need to make sure each section has enough depth. Let me think about the structure. Maybe start with an overview of SHA-256, then history, technical details, applications, security aspects, and related standards.

Wait, the user mentioned "라이선스" (license) as a subcategory. But SHA-256 is a cryptographic algorithm, not a license. Hmm, maybe there's a misunderstanding here. The original query might have an error in categorization. However, I should proceed with the given categories. Maybe the license part refers to the licensing of the algorithm? Or perhaps it's a mistake. Since the user specified "라이선스" as the subcategory, I need to address that. But SHA-256 is part of the SHA-2 family developed by NIST, which is public domain. So maybe there's no specific license for it. Alternatively, maybe the user meant something else. I'll proceed with the technical aspects and note any possible confusion.

Next, the content needs to be accurate and objective. I should mention that SHA-256 is part of SHA-2, developed by NIST in 2001, based on SHA-1 but more secure. Technical details: input size up to 2^64 - 1 bits, output 256 bits. Explain the algorithm steps briefly—message padding, parsing into blocks, initializing hash values, processing each block with compression function.

Applications: Bitcoin and other cryptocurrencies use it for blockchain. SSL/TLS for data integrity. Digital signatures. Also mention that it's used in various security protocols.

Security aspects: No known collisions as of now, but SHA-3 is a newer alternative. Mention the transition from SHA-1 to SHA-2 due to vulnerabilities.

References: NIST publications, RFCs, academic papers. Maybe include links if possible, but since this is markdown, just mention them.

I need to check for technical terms and explain them. For example, "hash function" can be explained as a function that maps data of arbitrary size to fixed-size values. Also, clarify what a cryptographic hash function does—secure, collision-resistant, etc.

Make sure the document is over 800 characters. Let me count: each section should have enough content. Maybe add subsections under technical details like message processing steps, compression function, and security analysis.

Avoid markdown in the thinking process but structure the final answer with H1, H2, H3. Use bullet points for lists, code blocks if needed (though not sure if any code here). Ensure readability with clear headings and explanations.