Data Eraser - Shredder

**Publisher:** OscarTech

**App:** Data Eraser (`com.oscartech.shredder`)

**Version:** 1.01

**Last updated:** 27 July 2026

## 1. Purpose of the app

Data Eraser is a privacy tool for permanently removing files, folders and

residual data from a device you own. It is intended for legitimate data-hygiene

purposes such as protecting personal information, removing sensitive documents,

and preparing a device for resale, repair or disposal.

## 2. Acceptable use

You agree to use Data Eraser only:

- on files, folders and storage that you own, or that you are explicitly

authorised by the owner to erase;

- on devices you own or administer;

- in compliance with all laws and regulations that apply to you.

## 3. Prohibited use

You must not use Data Eraser to:

- destroy, conceal or tamper with evidence relevant to any investigation,

litigation, audit or legal proceeding;

- circumvent data-retention duties imposed on you or your employer by law,

regulation or contract;

- erase data belonging to another person or organisation without authorisation,

including on shared, borrowed, corporate or managed devices;

- interfere with the operation of a device you do not control.

## 4. Irreversibility and user responsibility

Shredding is deliberately irreversible. The app cannot restore shredded data and

neither OscarTech nor any third party can recover it for you. You are solely

responsible for verifying your selection before confirming a shred operation.

Back up anything you may need before using the app.

## 5. Technical limitations (best-effort erasure)

Data Eraser performs a **best-effort** secure erase. Android devices use flash

storage (eMMC/UFS) whose internal controllers may remap logical blocks through

wear-leveling and over-provisioning. As a result:

- overwriting a file makes recovery extremely difficult using software tools;

- it does **not** guarantee that every physical copy of every byte has been

destroyed;

- a specialised laboratory with chip-level access may still recover fragments.

For the strongest practical guarantee, combine Data Eraser with full-disk

encryption (enabled by default on Android 7 and later) and a factory reset.

Algorithms such as DoD 5220.22-M and Gutmann were designed for magnetic

(spinning-disk) media. On flash storage their original guarantees do not

strictly apply; they are offered because many users and organisational policies

require these specific patterns.

### 5.1 Copies outside the app's reach

Shredding affects the file you select, its entry in the system media database

and — on Android 9 and older — its cached thumbnail files. Android does not

permit an installed app to reach every copy that may exist. In particular, the

following are **not** erased by Data Eraser:

- **Cloud backups.** A photo already synced to Google Photos, Drive, OneDrive or

a similar service continues to exist on that service. Delete it there as well.

- **Copies held by other apps.** Messaging and social apps commonly save their

own copy in private storage that no other app may open.

- **The system thumbnail cache on Android 10 and later.** It was moved into

protected storage that no installed app can access. Data Eraser removes the

media-database entry, which stops the item being listed, but cannot overwrite

the cached image itself.

- **Copies on other devices or removable media** that were not selected.

If a file is sensitive enough to shred, review your cloud backups and any app

that may have received a copy.

## 6. Privacy

Data Eraser works entirely offline. It has no internet permission, contains no

advertising or analytics SDKs, requires no account, and transmits nothing off

the device. The optional shred history is stored in a local database on the

device only and can be deleted at any time from the History tab.

Storage access is requested only through Android's system document picker, and

only for the items you explicitly select.

## 7. No warranty / limitation of liability

The app is provided "as is", without warranty of any kind, express or implied,

including fitness for a particular purpose. To the maximum extent permitted by

law, OscarTech accepts no liability for any loss of data, loss of profit, or

other damage arising from the use or misuse of the app — including data erased

intentionally or accidentally.

## 8. Changes to this policy

This policy may be updated when app functionality changes. The current version

is always available inside the app under the **About** tab.

## 9. Contact

For questions about this policy, contact OscarTech through the developer contact

details listed on the app's Google Play store page.