You share a document with several people. Later it turns up somewhere it shouldn't.
SP Tracer tells you exactly who leaked it.
Before you send a file, the app embeds an invisible personal mark. If that file surfaces — open it in SP Tracer and it names the recipient whose copy it was.
Each recipient gets their own invisibly marked copy. The mark is embedded simultaneously through two independent channels for reliability:
- Invisible Unicode characters placed inside the text
- Hidden text token embedded in the document structure
- LSB steganography for PNG/BMP/TIFF images (data hidden directly in pixels)
When a suspicious file appears, SP Tracer scans it, recovers the mark (even from a partially damaged file — thanks to error-correction coding), and looks up the matching entry in the issue log.
Issue a copy — fill in recipient details, choose a file:
Check a suspicious file — the app identifies the source:
Journal — full log of all issued copies with checksum protection:
- Invisible marking — recipients cannot see or detect their mark
- Two independent channels — text steganography + hidden token; images use LSB pixel steganography
- Error-correction coding — mark survives partial file damage
- Issue journal — every copy logged: recipient, contact, file name, timestamp
- Leak verification — open any suspicious file and get the recipient's name in seconds
- Database integrity — export/import journal backup, built-in checksum to detect tampering
- Fully offline & portable — no internet, no installation, no server; runs from a USB drive
- Bilingual UI — switch between Russian and English on the fly, no restart needed
- PyArmor licensed — key-based activation tied to machine
| Format | Where the mark is hidden | Reliability |
|---|---|---|
Code & text .py .txt .md .csv |
Invisible Unicode + hidden token | High |
Word documents .docx .doc |
Invisible Unicode in text + hidden paragraph | High |
PDF .pdf |
Invisible text layers + metadata | Medium |
Images .png .bmp .tiff |
LSB pixel steganography + text chunk | High (until re-compression) |
Images .jpg |
EXIF metadata | Low (easily stripped) |
Honest note: the mark does not survive a screenshot, manual retyping, or JPEG re-compression.
It reliably catches the most common leak scenario — a file forwarded as-is.
- Windows 10 / 11 (64-bit)
- Portable — no installation required, runs from any folder or USB drive
- License key file placed next to
SP Tracer.exe
Source code is not public. SP Tracer is a commercial product distributed under the ShashevPro brand with a machine-bound license key.
Buy a license, order a build, or request a demo:
- 🌐 Website — shashevpro.ru
- 🛒 Order on Kwork — kwork.ru/user/andreysha256
- ✉️ Email — programmer@shashevpro.ru
- 💬 VK — vk.com/andrey_shashev
© ShashevPro · Andrey Shashev — commercial software, source not public.