add thread safety notes

programming/cplusplus/index.md

@@ -65,6 +65,11 @@ For a peek of DBR C++ Edition history, check the [Release Notes]({{ site.dbr_cpp
 To develop and run your application with Dynamsoft Barcode Reader SDK, you need an active license key:
 * <a href="https://www.dynamsoft.com/customer/license/trialLicense?utm_source=docs&product=dbr&package=c_cpp" target="_blank">Request a 30-day free trial license</a>
 
+## Thread Safety
+
+The SDK supports multi-threaded applications, but individual SDK instances are not thread-safe.  
+For concurrent processing, create a separate instance for each thread.
+
 ## Contact Us
 
 <a href="https://www.dynamsoft.com/company/customer-service/#contact" target="_blank">Feel free to contact us if you have any questions.</a>

programming/cplusplus/user-guide.md

@@ -113,6 +113,11 @@ CLicenseManager::InitLicense("DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9", errorMs
 ```cpp
 CCaptureVisionRouter* cvRouter = new CCaptureVisionRouter;
 ```
+
+> [!IMPORTANT]
+> Instances of `CCaptureVisionRouter` are not thread-safe.  
+> Do not access the same `CCaptureVisionRouter` instance from multiple threads concurrently.  
+> Create a separate instance for each thread if concurrent processing is required.
 
 ---
 

programming/dotnet/index.md

@@ -58,6 +58,11 @@ For a peek of DBR .NET Edition history, check the [Release Notes]({{ site.dbr_do
 To develop and run your application with Dynamsoft Barcode Reader SDK, you need an active license key:
 * <a href="https://www.dynamsoft.com/customer/license/trialLicense?utm_source=docs&product=dbr&package=dotnet" target="_blank">Request a 30-day free trial license</a>
 
+## Thread Safety
+
+The SDK supports multi-threaded applications, but individual SDK instances are not thread-safe.  
+For concurrent processing, create a separate instance for each thread.
+
 ## Contact Us
 
 <a href="https://www.dynamsoft.com/company/customer-service/#contact" target="_blank">Feel free to contact us if you have any questions.</a>

programming/dotnet/user-guide.md

@@ -97,6 +97,12 @@ using (CaptureVisionRouter cvRouter = new CaptureVisionRouter())
     //code for invoking the barcode capturing
 }
 ```
+
+> [!IMPORTANT]
+> Instances of `CaptureVisionRouter` are not thread-safe.  
+> Do not access the same `CaptureVisionRouter` instance from multiple threads concurrently.  
+> Create a separate instance for each thread if concurrent processing is required.
+
 
 ### Invoke the Barcode Capturing
 

programming/java/index.md

@@ -56,6 +56,11 @@ For a peek of DBR Java Edition history, check the [Release Notes]({{ site.dbr_ja
 To develop and run your application with Dynamsoft Barcode Reader SDK, you need an active license key:
 * <a href="https://www.dynamsoft.com/customer/license/trialLicense?utm_source=docs&product=dbr&package=java" target="_blank">Request a 30-day free trial license</a>
 
+## Thread Safety
+
+The SDK supports multi-threaded applications, but individual SDK instances are not thread-safe.  
+For concurrent processing, create a separate instance for each thread.
+
 ## Contact Us
 
 <a href="https://www.dynamsoft.com/company/customer-service/#contact" target="_blank">Feel free to contact us if you have any questions.</a>

programming/java/user-guide.md

@@ -122,6 +122,12 @@ public class ReadAnImage {
 ```java
 CaptureVisionRouter cvRouter = new CaptureVisionRouter();
 ```
+
+> [!IMPORTANT]
+> Instances of `CaptureVisionRouter` are not thread-safe.  
+> Do not access the same `CaptureVisionRouter` instance from multiple threads concurrently.  
+> Create a separate instance for each thread if concurrent processing is required.
+
 
 ### Invoke the Barcode Capturing
 

programming/python/index.md

@@ -68,6 +68,11 @@ For a peek of DBR Python Edition history, check the [Release Notes]({{ site.dbr_
 To develop and run your application with Dynamsoft Barcode Reader SDK, you need an active license key:
 * <a href="https://www.dynamsoft.com/customer/license/trialLicense?utm_source=docs&product=dbr&package=python" target="_blank">Request a 30-day free trial license</a>
 
+## Thread Safety
+
+The SDK supports multi-threaded applications, but individual SDK instances are not thread-safe.  
+For concurrent processing, create a separate instance for each thread.
+
 ## Contact Us
 
 <a href="https://www.dynamsoft.com/company/customer-service/#contact" target="_blank">Feel free to contact us if you have any questions.</a>

programming/python/user-guide.md

@@ -82,6 +82,12 @@ else:
 ```python
 cvr_instance = CaptureVisionRouter()
 ```
+
+> [!IMPORTANT]
+> Instances of `CaptureVisionRouter` are not thread-safe.  
+> Do not access the same `CaptureVisionRouter` instance from multiple threads concurrently.  
+> Create a separate instance for each thread if concurrent processing is required.
+
 
 ### Invoke the Barcode Capturing